1 /* Low level interface to i386 running the GNU Hurd.
3 Copyright (C) 1992-2019 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 /* Include this first, to pick up the <mach.h> 'thread_info' diversion. */
23 /* Mach/Hurd headers are not yet ready for C++ compilation. */
27 #include <mach_error.h>
28 #include <mach/message.h>
29 #include <mach/exception.h>
35 #include "floatformat.h"
38 #include "i386-tdep.h"
40 #include "inf-child.h"
41 #include "i387-tdep.h"
43 /* Offset to the thread_state_t location where REG is stored. */
44 #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
46 /* At REG_OFFSET[N] is the offset to the thread_state_t location where
47 the GDB register N is stored. */
48 static int reg_offset
[] =
50 REG_OFFSET (eax
), REG_OFFSET (ecx
), REG_OFFSET (edx
), REG_OFFSET (ebx
),
51 REG_OFFSET (uesp
), REG_OFFSET (ebp
), REG_OFFSET (esi
), REG_OFFSET (edi
),
52 REG_OFFSET (eip
), REG_OFFSET (efl
), REG_OFFSET (cs
), REG_OFFSET (ss
),
53 REG_OFFSET (ds
), REG_OFFSET (es
), REG_OFFSET (fs
), REG_OFFSET (gs
)
56 #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
60 /* The i386 GNU Hurd target. */
62 #ifdef i386_DEBUG_STATE
63 using gnu_base_target
= x86_nat_target
<gnu_nat_target
>;
65 using gnu_base_target
= gnu_nat_target
;
68 struct i386_gnu_nat_target final
: public gnu_base_target
70 void fetch_registers (struct regcache
*, int) override
;
71 void store_registers (struct regcache
*, int) override
;
74 static i386_gnu_nat_target the_i386_gnu_nat_target
;
76 /* Get the whole floating-point state of THREAD and record the values
77 of the corresponding (pseudo) registers. */
80 fetch_fpregs (struct regcache
*regcache
, struct proc
*thread
)
82 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
83 struct i386_float_state state
;
86 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
87 (thread_state_t
) &state
, &count
);
90 warning (_("Couldn't fetch floating-point state from %s"),
91 proc_string (thread
));
95 if (!state
.initialized
)
97 /* The floating-point state isn't initialized. */
98 i387_supply_fsave (regcache
, -1, NULL
);
102 /* Supply the floating-point registers. */
103 i387_supply_fsave (regcache
, -1, state
.hw_state
);
107 /* Fetch register REGNO, or all regs if REGNO is -1. */
109 gnu_fetch_registers (struct target_ops
*ops
,
110 struct regcache
*regcache
, int regno
)
113 ptid_t ptid
= regcache
->ptid ();
115 /* Make sure we know about new threads. */
116 inf_update_procs (gnu_current_inf
);
118 thread
= inf_tid_to_thread (gnu_current_inf
, ptid
.lwp ());
120 error (_("Can't fetch registers from thread %s: No such thread"),
121 target_pid_to_str (ptid
));
123 if (regno
< I386_NUM_GREGS
|| regno
== -1)
125 thread_state_t state
;
127 /* This does the dirty work for us. */
128 state
= proc_get_state (thread
, 0);
131 warning (_("Couldn't fetch registers from %s"),
132 proc_string (thread
));
140 proc_debug (thread
, "fetching all register");
142 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
143 regcache
->raw_supply (i
, REG_ADDR (state
, i
));
144 thread
->fetched_regs
= ~0;
148 proc_debug (thread
, "fetching register %s",
149 gdbarch_register_name (regcache
->arch (),
152 regcache
->raw_supply (regno
, REG_ADDR (state
, regno
));
153 thread
->fetched_regs
|= (1 << regno
);
157 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
159 proc_debug (thread
, "fetching floating-point registers");
161 fetch_fpregs (regcache
, thread
);
166 /* Store the whole floating-point state into THREAD using information
167 from the corresponding (pseudo) registers. */
169 store_fpregs (const struct regcache
*regcache
, struct proc
*thread
, int regno
)
171 mach_msg_type_number_t count
= i386_FLOAT_STATE_COUNT
;
172 struct i386_float_state state
;
175 err
= thread_get_state (thread
->port
, i386_FLOAT_STATE
,
176 (thread_state_t
) &state
, &count
);
179 warning (_("Couldn't fetch floating-point state from %s"),
180 proc_string (thread
));
184 /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow
185 take into account DEPRECATED_REGISTER_VALID like the old code did? */
186 i387_collect_fsave (regcache
, regno
, state
.hw_state
);
188 err
= thread_set_state (thread
->port
, i386_FLOAT_STATE
,
189 (thread_state_t
) &state
, i386_FLOAT_STATE_COUNT
);
192 warning (_("Couldn't store floating-point state into %s"),
193 proc_string (thread
));
198 /* Store at least register REGNO, or all regs if REGNO == -1. */
200 gnu_store_registers (struct target_ops
*ops
,
201 struct regcache
*regcache
, int regno
)
204 struct gdbarch
*gdbarch
= regcache
->arch ();
205 ptid_t ptid
= regcache
->ptid ();
207 /* Make sure we know about new threads. */
208 inf_update_procs (gnu_current_inf
);
210 thread
= inf_tid_to_thread (gnu_current_inf
, ptid
.lwp ());
212 error (_("Couldn't store registers into thread %s: No such thread"),
213 target_pid_to_str (ptid
));
215 if (regno
< I386_NUM_GREGS
|| regno
== -1)
217 thread_state_t state
;
218 thread_state_data_t old_state
;
219 int was_aborted
= thread
->aborted
;
220 int was_valid
= thread
->state_valid
;
223 if (!was_aborted
&& was_valid
)
224 memcpy (&old_state
, &thread
->state
, sizeof (old_state
));
226 state
= proc_get_state (thread
, 1);
229 warning (_("Couldn't store registers into %s"),
230 proc_string (thread
));
234 /* Save the T bit. We might try to restore the %eflags register
235 below, but changing the T bit would seriously confuse GDB. */
236 trace
= ((struct i386_thread_state
*)state
)->efl
& 0x100;
238 if (!was_aborted
&& was_valid
)
239 /* See which registers have changed after aborting the thread. */
243 for (check_regno
= 0; check_regno
< I386_NUM_GREGS
; check_regno
++)
244 if ((thread
->fetched_regs
& (1 << check_regno
))
245 && memcpy (REG_ADDR (&old_state
, check_regno
),
246 REG_ADDR (state
, check_regno
),
247 register_size (gdbarch
, check_regno
)))
248 /* Register CHECK_REGNO has changed! Ack! */
250 warning (_("Register %s changed after the thread was aborted"),
251 gdbarch_register_name (gdbarch
, check_regno
));
252 if (regno
>= 0 && regno
!= check_regno
)
253 /* Update GDB's copy of the register. */
254 regcache
->raw_supply (check_regno
,
255 REG_ADDR (state
, check_regno
));
257 warning (_("... also writing this register! "
266 proc_debug (thread
, "storing all registers");
268 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
269 if (REG_VALID
== regcache
->get_register_status (i
))
270 regcache
->raw_collect (i
, REG_ADDR (state
, i
));
274 proc_debug (thread
, "storing register %s",
275 gdbarch_register_name (gdbarch
, regno
));
277 gdb_assert (REG_VALID
== regcache
->get_register_status (regno
));
278 regcache
->raw_collect (regno
, REG_ADDR (state
, regno
));
281 /* Restore the T bit. */
282 ((struct i386_thread_state
*)state
)->efl
&= ~0x100;
283 ((struct i386_thread_state
*)state
)->efl
|= trace
;
286 if (regno
>= I386_NUM_GREGS
|| regno
== -1)
288 proc_debug (thread
, "storing floating-point registers");
290 store_fpregs (regcache
, thread
, regno
);
295 /* Support for debug registers. */
297 #ifdef i386_DEBUG_STATE
298 /* Get debug registers for thread THREAD. */
301 i386_gnu_dr_get (struct i386_debug_state
*regs
, struct proc
*thread
)
303 mach_msg_type_number_t count
= i386_DEBUG_STATE_COUNT
;
306 err
= thread_get_state (thread
->port
, i386_DEBUG_STATE
,
307 (thread_state_t
) regs
, &count
);
308 if (err
!= 0 || count
!= i386_DEBUG_STATE_COUNT
)
309 warning (_("Couldn't fetch debug state from %s"),
310 proc_string (thread
));
313 /* Set debug registers for thread THREAD. */
316 i386_gnu_dr_set (const struct i386_debug_state
*regs
, struct proc
*thread
)
320 err
= thread_set_state (thread
->port
, i386_DEBUG_STATE
,
321 (thread_state_t
) regs
, i386_DEBUG_STATE_COUNT
);
323 warning (_("Couldn't store debug state into %s"),
324 proc_string (thread
));
327 /* Set DR_CONTROL in THREAD. */
330 i386_gnu_dr_set_control_one (struct proc
*thread
, void *arg
)
332 unsigned long *control
= (unsigned long *) arg
;
333 struct i386_debug_state regs
;
335 i386_gnu_dr_get (®s
, thread
);
336 regs
.dr
[DR_CONTROL
] = *control
;
337 i386_gnu_dr_set (®s
, thread
);
340 /* Set DR_CONTROL to CONTROL in all threads. */
343 i386_gnu_dr_set_control (unsigned long control
)
345 inf_update_procs (gnu_current_inf
);
346 inf_threads (gnu_current_inf
, i386_gnu_dr_set_control_one
, &control
);
349 /* Parameters to set a debugging address. */
353 int regnum
; /* Register number (zero based). */
354 CORE_ADDR addr
; /* Address. */
357 /* Set address REGNUM (zero based) to ADDR in THREAD. */
360 i386_gnu_dr_set_addr_one (struct proc
*thread
, void *arg
)
362 struct reg_addr
*reg_addr
= (struct reg_addr
*) arg
;
363 struct i386_debug_state regs
;
365 i386_gnu_dr_get (®s
, thread
);
366 regs
.dr
[reg_addr
->regnum
] = reg_addr
->addr
;
367 i386_gnu_dr_set (®s
, thread
);
370 /* Set address REGNUM (zero based) to ADDR in all threads. */
373 i386_gnu_dr_set_addr (int regnum
, CORE_ADDR addr
)
375 struct reg_addr reg_addr
;
377 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
379 reg_addr
.regnum
= regnum
;
380 reg_addr
.addr
= addr
;
382 inf_update_procs (gnu_current_inf
);
383 inf_threads (gnu_current_inf
, i386_gnu_dr_set_addr_one
, ®_addr
);
386 /* Get debug register REGNUM value from only the one LWP of PTID. */
389 i386_gnu_dr_get_reg (ptid_t ptid
, int regnum
)
391 struct i386_debug_state regs
;
394 /* Make sure we know about new threads. */
395 inf_update_procs (gnu_current_inf
);
397 thread
= inf_tid_to_thread (gnu_current_inf
, ptid
.lwp ());
398 i386_gnu_dr_get (®s
, thread
);
400 return regs
.dr
[regnum
];
403 /* Return the inferior's debug register REGNUM. */
406 i386_gnu_dr_get_addr (int regnum
)
408 gdb_assert (DR_FIRSTADDR
<= regnum
&& regnum
<= DR_LASTADDR
);
410 return i386_gnu_dr_get_reg (inferior_ptid
, regnum
);
413 /* Get DR_STATUS from only the one thread of INFERIOR_PTID. */
416 i386_gnu_dr_get_status (void)
418 return i386_gnu_dr_get_reg (inferior_ptid
, DR_STATUS
);
421 /* Return the inferior's DR7 debug control register. */
424 i386_gnu_dr_get_control (void)
426 return i386_gnu_dr_get_reg (inferior_ptid
, DR_CONTROL
);
428 #endif /* i386_DEBUG_STATE */
431 _initialize_i386gnu_nat (void)
433 #ifdef i386_DEBUG_STATE
434 x86_dr_low
.set_control
= i386_gnu_dr_set_control
;
435 gdb_assert (DR_FIRSTADDR
== 0 && DR_LASTADDR
< i386_DEBUG_STATE_COUNT
);
436 x86_dr_low
.set_addr
= i386_gnu_dr_set_addr
;
437 x86_dr_low
.get_addr
= i386_gnu_dr_get_addr
;
438 x86_dr_low
.get_status
= i386_gnu_dr_get_status
;
439 x86_dr_low
.get_control
= i386_gnu_dr_get_control
;
440 x86_set_debug_register_length (4);
441 #endif /* i386_DEBUG_STATE */
443 /* Register the target. */
444 add_inf_child_target (&the_i386_gnu_nat_target
);